[wp-trac] [WordPress Trac] #63793: Parser-blocking scripts should render last in all cases to speed up page load

[WordPress Trac]

#63793: Parser-blocking scripts should render last in all cases to speed up page
load
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 Reporter:  kkmuffme       |       Owner:  (none)
     Type:  enhancement    |      Status:  new
 Priority:  normal         |   Milestone:  Future Release
Component:  Script Loader  |     Version:  2.1
 Severity:  normal         |  Resolution:
 Keywords:  has-patch      |     Focuses:  javascript, performance
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Comment (by kkmuffme):

 Replying to [comment:1 westonruter]:
 > @kkmuffme
 >
 > > Printing them in the following order, will significantly speed up
 reaching DOMContentLoaded, without having any impact on functionality
 >
 > Have you benchmarked this to demonstrate the performance improvement? I
 don't see how this will reduce the time to DCL since it will always be
 blocked by `b.js` in your example.

 The reason it works is bc the difference between render and parser
 blocking and is the basis for defer/async. If this wouldn't improve page
 load, then async/defer would be pointless to begin with

 Anyway, benchmarks are in :-)

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Ticket URL: <https://core.trac.wordpress.org/ticket/63793#comment:14>
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